Oscillating device for motor-driven fans.



PATENTED JUNE 25, 1907.

H. S. BROWN. OSGILLATING DEVICE FOR MOTOR DRIVEN FANS.

APPLICATION FILED JUNE 26, 1902.

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1-74: NORRIS PETERS cw) wAsmncwu. n. c

No.'857,787. PATENTED JUNE 25, 1907.

' 1H. s. BROWN.

OSGILLATIN'G DEVICE FOR MOTOR DRIVEN FANS.

APPLICATION I'ILED mm: 26. 1902.

3 SHEETS-SHEET 2.

ORRIS PETERS ca u/Asnnyoron, v. c.

PATENTED JUNE 25, 1907. H. S.-BROWN. v OSOILLATING DEVICE FOR MOTOR DRIVEN FANS.

APPLICATION FILED JUNE 26. 1902.

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UNITED STATES PATENT OFFICE.

OSCILLATING DEVICE FOR MOTOR-DRIVEN FANS- Specification of Letters Patent.

Patented June 25, 1907.

Application filed June 26, 1902. Serial No. 113,216.

To all whom, it may concern;

Be it known that I, HERBERT S. BROWN, a citizen of the United States, and a resident of the city of New York, in the county and State of New York, have invented certain new and useful Improvements in Oscillating Devices for Motor-Driven Fans, of Which the following is a specification.

The object of my invention is to provide a support for the motor-driven fan used for creatin a circulation or disturbance in the atmosphere which shall constantly vary the direction of the current of air; and a further object is to provide a support of the character described which is universally applicable Without change or modification in the motor or fan mechanism.

I provide a hinged or pivoted support in two sections, one of these sections is connected to the other by a hinge or pivot, preferably all hinges and pivots have frictionless bearings, such as the well known ball bearing. The first or main section of the support may be in the form of an arm supported on a vertical pivot or hinge, the second section is supported at the end of the first upon a similar vertical pivot or hinge; the motor-driven fan is supported on the end of the second section and I provide means for limiting the extent of movement of each section of the support upon its hinge or pivot, that is, I establish a limit of movement for each section of the support so arranged that the limit to the movement of the first section will become effective before the limit of movement upon the second section becomes efl'ective. It results from this that when the blades of the fan in rotating force the air outwardly from the face of the blades, the eifort of the fan reacts and causes the fan to retreat or move in a direction the reverse of the direction of the current of air. This movement of rotation in the arc of a circle occurs. upon the hinged support of the main or first section and continues until the limit of movement for that section is attained, the movement is then continued by the momentum of the motor and fan, the rotation being transferred to the hinged-support of the second section and continues until the limit of movement of the second section is reached: This movement upon the hinged support of the second section has caused the plane of the fan to gradually change its position with reference to,

the hinged support of the first or main section and the push or force exerted by the fan is now in a direction which produces a reverse movement, a rotation upon the hinged support of the first section; this movement continues until the limit is reached, then occurs the described movement of the second section until its limit is reached and the reversal in the propulsive eifort of the fan as described. I have shown and described two mechanical devices for establishing this limit of movement for the two sectional supports: in one case I provide adjustable mechanical stops and in the other case I provide for increasing the work of the motor and fan in its movement from one side to the other and for varying this Work by the aid of gravity.

The accompanying drawings illustrate my invention.

Figure 1 is a vertical elevation of a form of motor-driven fan supported upon my oscillatingsupport; Fig. 2 is a top plan view; Fig. 3 is a vertical section; Figs. {i and 5 are detail views of the supporting pivots; Figs. 6, 7 and 8, are views taken on the line A, B, Fig. 1, showing the parts in different position; Fig. 9 shows the bracket with the adjustable mechanicalstops and Figs. 10 and 11 show modifications in the means for limiting the extent of motion;

In Fig. 1, m is a motor, preferably an electric motor, supported upon the standard 8; f is a propeller blade fan rotating in the direction of the arrow; 1) is a bracket fixed to the wall or other suitable support; 9 is an arm or equivalent device and h is an arm or platform constituting the immediate support for the fan; 9 is supported upon a hinge a which is fixed to the bracket 1) and h is hinged to the arm or section 9 by means of the hinged or pivot bearing cc. The pivot 22 of the hinge a, is fixed to the bracket 1) and the pivot 23 of the hinge 0c is fixed to the section h, both hinges have the usual arrangement of cones and ball bearing 24. As shown in Figs. 1 to 9 inclusive, the pivots 22 and 28 are arranged parallel and vertical. I provide limits of movement for the arm or section 9; these consist of two pins p and 9 adjustable in slotted bearings 'L in the bracket 1), see Fig. 9. I have shown means for adjustment of 180 degrees or more, but this extent may be increased or decreased at pleasure. For the urpose of establishing a limit of movement for the second sectional support it upon its hinge as, I provide a cord 0, Which may be more or-less resilient. I attach one end to the screw 19 in the lug 20 forming part of the section it and the other end to an eye 21 upon the arm or section 9; this limits the extent of movement of the second section of the suport h with respect to the first section 9. I lhcate the fan and motor upon the support7t so that the center of gravity is slightly off the center of balance of the supporting pivot 23 that is, slightly forward of it.

The operation of the support is as follows: Let us assume the fan to be rotating in the direction of the arrow, Fig. 1. When the central plane through the axis of rotation of the motor and fan is exactly in line with the central plane of the arm g, the apparatus is on a dead center or in equilibrium. To start the continuous operation, deflect the second section of the support or turn it upon the hinge ac and the fan will recede or move away, turning upon the hinge 0 until the arm 9 engages the stop g; the movement upon the hinge a is stopped, but movement upon the hinge ac immediately begins by reason of the momentum due to the described rotation, and the plane of the fan changes its direction, the motor fan moving upon the hinge so until it reaches a limit of movement established by the cord 0 as shown in Fig. 8. The change in the direction of the motor driven air current causes a change in the direction of the reaction of the motor and its support, the movement now being upon the hinge (1 again. This continues until the arm y engages the stop 1); the motor then continues its movement turning upon the hinge 00 until the limit of movement established by the cord 0, in the opposite direction, is again reached; the motor now faces in the opposite direction from that last above assumed, and the excursion to and fro continues as long as the motor is operated.

In Fig. 10, I have shown a modification in the character of the stops or limits of movement for the two sections of the support. I employ gravity and a variation in the work performed by the fan in propelling itself so that in efiect it runs up a grade upon each side of a central point. For this purpose I place the hinge a at a slight inclination from the vertical and the hinge 00 at a slight inclination from the aXis of the hinge a, that is, the pivots of the hinges 2c and a are not eX- actly parallel, the pivot of as being inclined slightly with respect to the pivot of the hinge a; the pivots of both hinges are therefore located at an inclination to the vertical and to each other. The center of gravity of motor and fan is placed slightly off the center of balance of supporting pivot 23, that is, slightly forward of it. Starting with the fan motor at the lowest point or at rest, so that the center of gravity is at the lowest point it can assume, I deflect the second section of the support or turn it upon the hinge 0c; the fan will recede or move away, turning upon hinge 00. But this movement carries the center of gravity of the motor and fan up grade, the end of the arm 9 in its rotation traveling up grade with reference to the horizontal when it leaves the point it assumed when the apparatus is at rest. At some point this up grade work against gravity becomes equal to the re-action of the fan and the arm 9 comes to a stop. The momentum continues the rotation, but upon the hinge x. This by changing the angle of the plane of the fan with respect to the arm g causes the pressure against that arm to decrease, and the force of gravity now becoming the greater, arm 9 recedes toward its lowest point. The movement upon hinge as has in the meantime continued, re-inforced by the return motion of the arm g, and this motion upon a: continues, past the lowest point of the center of gravity of the motor with reference to x and up the grade on the other side, coming to rest when this up grade work against gravity counter-balances the tendency to rotate upon a: as above described. The fan now faces in an opposite direction with reference to the arm 9 from that in which it first started, and the reverse rotation of the apparatus on a already started by the down grade movement of the arm g, is now increased by the reaction of the fan and arm g is moved past its dead center and up grade on the other side, until the force impelling it becomes again counter-balanced by gravity, and the arm g stops. The rotation then continues as before upon 00, due partly to the momentum'of the rotation upon a and partly to the already started downward movement of the center of gravity of the fan to its lowest point -with reference to m. The arm 9 recedes and the rotation is reversed as before. In other words, the section of the support 9 is carried up an incline by the action of the motor fan and reaches a limit of its movement in operating against gravity, when it stops in substantially the same way as herein described with respect to the mechanical stop 19 or q. The section of the sup port 7t turning on the hinge 00 now passes the central point and reversing its direction reaches a limit of movement due to the increased Work performed in opposition to gravity as it rides up the incline; the reversed movement then takes place and the operation is repeated as already described. It is designed to have the movement upon one of these pivots a freer and of greater eX- tent than the movement upon the other pivot w. This is effected in the construction shown by making the inclination, hence grade, of pivot at, slightly greater, with reference to the vertical, than the inclination of 2. A motor fan support in two sections connected by a pivot and supported on a pivot, both said pivots located at an inclination to the vertical and to each other, and a motor and fan located on one section having its center of gravity to one side of the aXes of both pivots.

HERBERT S. BROWN. Witnesses:

CAROLINE E. DAVIDSON, ANNA M. DONLEVY. 

